What is cyclosporiasis, the disease behind rising diarrhea cases in the US?

An increase in diarrhea cases across the United States has brought attention to cyclosporiasis, a parasitic illness affecting more than 1,600 people this year. The cause of these infections is Cyclospora cayetanensis, a parasite that continues to pose questions for scientists.

While investigations have suggested a link between some outbreaks and contaminated lettuce, the source of thousands of other infections remains undetermined. This uncertainty complicates efforts to prevent further spread and understand the full scope of the problem.

Cyclosporiasis typically causes gastrointestinal distress, including diarrhea, loss of appetite, stomach cramps, bloating, and fatigue. The illness is often contracted by consuming food or water contaminated with the parasite's feces. Public health officials are working to identify common sources and implement control measures, but the elusive nature of the parasite's origin presents a significant challenge.